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calling same jsp on submit button

Diptee Bhakre
Greenhorn

Joined: Apr 06, 2010
Posts: 2
I am facing problem in my jsp.
I am calling same jsp called a.jsp when I click my submit button. I want to call getList() to call once when jsp is calling for first time and when submit is click , no need to call getList(). I am doing some opreation on arraylist provided by getList(). Could any body help me how I can achieved it? My jsp and java code is posted here. My code is as follows.
<%@page import="Processor"%>
<%@ page import="java.util.*, java.sql.* ,java.io.*"%>
<jsp:useBean id="bean" class="Processor" scope="session">
</jsp:useBean>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form name="branch" target="_top" action="" method="get">
<input type="submit" name="submit" value="submit"/>
</form>
<%! ArrayList list = new ArrayList(); %>
<%
if(!session.isNew())
{
list=bean.getList();

for (int i=0;i<list.size(); i++)
{

out.println("List is" + list.getList(i));

}
}
%>
</body>
</html>

Nd My bean class is as follows.
import java.io.*;
import java.util.*;

public class Processor
{
ArrayList allBranchList = new ArrayList();
public ArrayList getList()
{

try
{
String lineData = null;
File f = new File("C:/abc.txt");
FileReader fr = new FileReader(f);
BufferedReader bfr = new BufferedReader(fr);
while((lineData = bfr.readLine())!= null)
{
allBranchList.add(lineData);
}
}
catch( Exception e)
{
e.printStackTrace();
}
return allBranchList;
}


public static void main(String args[])
{


}

}


Thanks in advance.


Bear Bibeault
Author and ninkuma
Marshal

Joined: Jan 10, 2002
Posts: 61433
    
  67

The solution to many vexing problems like this is to structure your web apps properly. Step one of that effort is to remove all Java code from the JSPs and not use them as controllers.

Please read this article for information on properly structuring web apps.


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It is sorta covered in the JavaRanch Style Guide.
 
subject: calling same jsp on submit button